/*
** $Id: lfunc.h $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/

#ifndef lfunc_h
#define lfunc_h

#include "lobject.h"

#define sizeCclosure(n) (cast_int(luaport_offsetof(CClosure, upvalue)) + \
                         cast_int(sizeof(TValue)) * (n))

#define sizeLclosure(n) (cast_int(luaport_offsetof(LClosure, upvals)) + \
                         cast_int(sizeof(TValue *)) * (n))

/* test whether thread is in 'twups' list */
#define isintwups(L) (L->twups != L)

/*
** maximum number of upvalues in a closure (both C and Lua). (Value
** must fit in a VM register.)
*/
#define MAXUPVAL     255

#define upisopen(up) ((up)->v != &(up)->u.value)

#define uplevel(up)  check_exp(upisopen(up), cast(StkId, (up)->v))

/*
** maximum number of misses before giving up the cache of closures
** in prototypes
*/
#define MAXMISS      10

/* special status to close upvalues preserving the top of the stack */
#define CLOSEKTOP    (-1)

LUAI_FUNC Proto *luaF_newproto(lua_State *L);
LUAI_FUNC CClosure *luaF_newCclosure(lua_State *L, int nupvals);
LUAI_FUNC LClosure *luaF_newLclosure(lua_State *L, int nupvals);
LUAI_FUNC void luaF_initupvals(lua_State *L, LClosure *cl);
LUAI_FUNC UpVal *luaF_findupval(lua_State *L, StkId level);
LUAI_FUNC void luaF_newtbcupval(lua_State *L, StkId level);
LUAI_FUNC void luaF_closeupval(lua_State *L, StkId level);
LUAI_FUNC void luaF_close(lua_State *L, StkId level, int status, int yy);
LUAI_FUNC void luaF_unlinkupval(UpVal *uv);
LUAI_FUNC void luaF_freeproto(lua_State *L, Proto *f);
LUAI_FUNC const char *luaF_getlocalname(const Proto *func, int local_number,
                                        int pc);

#endif
